401 Bourdon Tube
Pressure Switch
General Instructions
This instruction provides information for mounting, electrical connections and calibration
®
of SOR
The process pressure is sensed by a limited
travel bourdon tube which is counter
balanced by a range spring (adjustable by
an adjustment screw). This acutates the
electrical snap-action switching element.
401 High-Range Bourdon Tube Pressure Switch.
401LC
NOTE: If you suspect that a product is defective, contact the factory or the SOR Representative
in your area for a return authorization number (RMA). This product should only be installed by
trained and competent personnel.
Mounting
Attach the switch to a suitable surface with two 1/4” diameter bolts. Line mounting by
either piping or electrical connections is not recommended.
Process Connection
Use two wrenches when connecting process piping to the process connection.
Use one 1-1/8” open end wrench to hold the hex while connecting the process piping.
Use the other wrench to tighten the process pipe or fitting.
Design and specifications are subject to change without notice.
Form 1214 (03.13) ©SOR Inc.
For latest revision, go to www.sorinc.com
Registered Quality System to ISO 9001
1/4
Electrical Connections
Switching elements are UL Listed and CSA Certified for AC service. They are SPDT
elements and may be wired to either make or break at a particular pressure on increasing
or decreasing pressure.
Install in accordance with all applicable codes or safety standards.
RN Housing
This housing has a 3/4” NPT(F) conduit outlet. The switching element in this housing
is wired to a terminal block marked NC - Normally Closed, NO - Normally Open and
C - Common.
TA or LC Housings
These housings have a 3/4” NPT(F) conduit connection and the micro switch is supplied
with wire leads. The leads are marked and color coded: C (Common) - Blue; NO (Normally
Open) - Black and NC (Normally Closed) - Red. All splices should be made outside
the housing.
Blue (C)
Black (NO)
Red (NC)
Pressure
On explosion proof units (LC and TA housings), power should be turned OFF
before the cover is removed.
2/4
Form 1214 (03.13) ©SOR Inc.
Calibration
Remove the cover and locate the 1/4” hex head adjusting screw. To increase the set point,
extend the spring by turning the adjusting screw clockwise. To decrease the set point, turn
the adjusting screw counterclockwise. An independent pressure source and gage should be
used for precise setting.
Do not adjust any other screws or brackets. Movement of these parts could
render the device inoperative.
Form 1214 (03.13) ©SOR Inc.
3/4
Printed in USA www.sorinc.com
14685 West 105th Street, Lenexa, KS 66215 913-888-2630 800-676-6794 USA Fax 913-888-0767
4/4
Registered Quality System to ISO 9001
Form 1214 (03.13) ©SOR Inc.
Loading...